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Re:Superpermutations by selimthegrim on Wednesday October 24, 2018 @12:26PM (#18293863)
Re:Superpermutations by JdeBP on Wednesday October 24, 2018 @12:41PM (#18294016)
One person in the 4chan discussion suggested writing an answer at https://math.stackexchange.com/questions/15510/ .